diff --git a/depend_test_framework/case_generator.py b/depend_test_framework/case_generator.py
index 8f97ec6..94e120b 100644
--- a/depend_test_framework/case_generator.py
+++ b/depend_test_framework/case_generator.py
@@ -33,16 +33,20 @@ def __init__(self, suit_env_limit=20, allow_dep=8, use_map=True):
         self._v_graph = None
 
     def find_suit_envs(self, env):
+        env_list = env if type(env) is list else [env]
         if not self.dep_graph:
             raise Exception('Need gen depend graph first')
-        tmp_list = []
-        for key_env in self.dep_graph.keys():
-            if env <= key_env:
-                tmp_list.append(key_env)
-
-        for i, tgt_env in enumerate(sorted(tmp_list, key=len)):
-            if i <= self._suit_env_limit:
-                yield tgt_env
+        env_record = []
+        for tmp_env in env_list:
+            tmp_list = []
+            for key_env in self.dep_graph.keys():
+                if tmp_env <= key_env:
+                    tmp_list.append(key_env)
+
+            for i, tgt_env in enumerate(sorted(tmp_list, key=len)):
+                if i <= self._suit_env_limit and tgt_env not in env_record:
+                    env_record.append(tgt_env)
+                    yield tgt_env
 
     def compute_route_permutations(self, src_env, target_env, cleanup=False):
         if not self.dep_graph:
@@ -69,7 +73,7 @@ def compute_route_permutations(self, src_env, target_env, cleanup=False):
     def gen_cases(self, test_func, random_cleanup=False, need_cleanup=False, src_env=None):
         if not src_env:
             src_env = Env()
-        target_env = Env.gen_require_env(test_func)
+        target_env = list(Env.gen_require_env(test_func))
         for tgt_env in self.find_suit_envs(target_env):
             cases = self.compute_route_permutations(src_env, tgt_env)
             if not tgt_env.gen_transfer_env(test_func):
diff --git a/depend_test_framework/env.py b/depend_test_framework/env.py
index 19f8eea..d39515c 100644
--- a/depend_test_framework/env.py
+++ b/depend_test_framework/env.py
@@ -3,6 +3,7 @@
 """
 import contextlib
 import copy
+import itertools
 
 from .log import get_logger
 from .dependency import Consumer, Provider, Cut, Graft, get_all_depend
@@ -105,7 +106,16 @@ def hit_require(self, depend):
         else:
             raise NotImplementedError
 
-        ret = self._get_data_from_path(depend.env_depend)
+        # TODO: support more kind of operation
+        paths = depend.env_depend.split('|')
+        for path in paths:
+            if self._valid_single_require(path, require):
+                return True
+
+        return False
+
+    def _valid_single_require(self, path, require):
+        ret = self._get_data_from_path(path)
         if ret is not None and (ret.struct_table() != '{}' or ret.data):
             return require
         else:
@@ -140,11 +150,16 @@ def gen_require_env(cls, func):
         return required env
         """
         cons = get_all_depend(func, depend_cls=Consumer)
-        env = cls()
+        env_paths = []
         for con in cons:
             if con.type == Consumer.REQUIRE:
-                env._set_data_from_path(con.env_depend, True)
-        return env
+                env_paths.append(con.env_depend.split('|'))
+        all_paths = itertools.product(*env_paths)
+        for paths in all_paths:
+            env = cls()
+            for path in paths:
+                env._set_data_from_path(path, True)
+            yield env
 
     def __reduce__(self):
         return self.__reduce_ex__(None)